The Space Marine DLCs are in my book harder, yes. Thats why I havent found the time yet, to go ahead with that challenge, but I will in the future. Though I'd first like to get that chess mode from Panzer Corps in Warhammer 40.000, I really love that mode, hopefully they will implement it.
As for the difference between Hard and Very Hard it was big in my perception. Not just downright ridiculous Enemy Mob Sizes but also fewer Points for your side and in my experience the AI almost always came up with better dice roll than I was. But I may be biased there
Still if you want a challenge give it a try!
A couple of advices I can give you:
1. Lose as little units as possible, the exp is really needed later on
2. Abuse those support units as much as possible, since they have no Ammo they can fire often.
3. Dont buy flyers
4. Dont go full Titans, they are good but way to expensive for more than 1 or 2
5. Remember to upgrade your units
6. You can switch between the different supporter according to your mission (a lot of Towns on the map go mortar, if you have open fields go fire support)
7. Always use choke points to your advantage
Most of these points you probably already know, since you but this game an thereby have a thing for Strategy games, but maybe some help you.
Good Luck in your Quest to fight back the Greenskins
